There is a strong demand for facilitation of management of storage region for DB data is required in a computer system combining an apparatus having the DBMS and virtualization function and software. In order to realize such requirement, the requirements for system management regarding a newly created DB and the information about the function to be set for the DB data are given to a system management server. The system management server detects a data structure of DB from such information and sends independently instructions to virtualization apparatuses to create virtual volumes or the like to which the data of each data structure is stored separately and set the function to the virtual volume as required. Thereafter, the system management server also issues an instruction to the DBMS to create a DB to store the data of data structure to the corresponding virtual volume.